BirdAnalyst
Species · BCR 32 · BBS 2025 Release · 1966–2024

Olive-sided Flycatcher In Coastal California

All regionsCoastal CaliforniaAerial insectivores

Olive-sided Flycatcher in Coastal California has fallen sharply: down 56% on the route-weighted index since 1970.

-56%Since 1970
64Routes In Region
56Years

Notable Signals

long arc declinecomputed index

Olive-sided Flycatcher has fallen sharply in Coastal California: down 56% on the route-weighted index since 1970.

Forecast

If the recent trend holds, Olive-sided Flycatcher in Coastal California is projected to fall about 43% by 2029 — from 1.3 in 2024 to a central estimate of 0.76 (95% range 0.00–1.9). A 5-year backtest shows a typical error of ±30.6%, with 100% of held-out values landing inside the 95% band.

-43%Change by 2029
0.76Projected 2029 index
0.00–1.995% range
±30.6%Backtest error
19682029
Projection of the recent trend (dashed) with 80/95% bands — a projection, not a prediction. Habitat, climate, and land use are not modeled.
YearProjected index95% low95% high
20250.860.002.0
20260.830.002.0
20270.810.001.9
20280.790.001.9
20290.760.001.9

Routes In Coastal California

Routes recording Olive-sided Flycatcher in Coastal California.
Waterman GapCALIFORNIA262024
PescaderoCALIFORNIA132024
Mt PinosCALIFORNIA122004
ValyermoCALIFORNIA122019
San Benito Mtn.CALIFORNIA112009
Point ReyesCALIFORNIA102023
Mt Pinos 2CALIFORNIA82024
FairfaxCALIFORNIA72024
Elizabeth LkCALIFORNIA71991
Green ValleyCALIFORNIA52023
Lake CachumaCALIFORNIA52016
ParkfieldCALIFORNIA41977
PowayCALIFORNIA41979
FallsvaleCALIFORNIA41981
Mt LagunaCALIFORNIA41981
Glen EllenCALIFORNIA42004
Sawmill MtnCALIFORNIA31996
LockwoodCALIFORNIA32024
ColmaCALIFORNIA21972
Foster ParkCALIFORNIA21992
Lake SuccessCALIFORNIA21996
Morro BayCALIFORNIA21991
Big BearCALIFORNIA21986
El ToroCALIFORNIA21983
JacumbaCALIFORNIA21992

Source: USGS North American Breeding Bird Survey, retrieved 2026-05-22.